Cpu Fan Pinout

Motherboard connector pin assignment.

Quiet cool whole house fan switch. You can make sure that the system isnt too loud with the fan only spinning up faster when your pc gets warm. What is the difference between three and four wire cpu fans. Fans and on board fan headers are backwards compatible.

A three pin connector is basically power 512 volt ground and signal. 3 pin connectors are usually used for the smaller chassis fans with lower power consumption. 3 pin fan and 4 pin motherboard connector compatibility.

Ground 12 v sense control. The tacho signal from the fan sinks to ground for every revolution the input on the motherboard is pulled high. The signal wire measures how fast the fan is moving without any controls for the fans speed.

A fan with a 3 pin power connector may be easilly fitted into desktop board with a 4 pin fan header. Superuser contributor homeydclownit has the answer for us. Fans and on board fan headers are backwards compatible.

I need to connect a non dell fan which has four wires. Fans with three pin connectors must be used on 3 pin cpu fan pinouts. A 4 pin fan uses its first three wires the same way a 3 pin fan does.

The sense pin is used to relay the rotation speed of the fan and the control pin is an open drain or open collector output which requires a pull up to 5 v or 33 v in the fan. Chassis and cpu fans may use either 3 pin or 4 pin power connectors. 4 pin connectors are usually used by cpu fans with higher power consumption.

The 3 pin senses fan rpm revolutions per minute. Is there 12 v ground rpm and pwm as usual or there is some proprietary fan control in place. Anyone knows the purpose of five cpu fan pins.

3 pin connectors are usually used for the smaller chassis fans with lower power consumption. Instead of simple speed up or slow down controls the fan can be set to specific fan speeds as the cpu gets hotter. 4 pin connectors are usually used by cpu fans with higher power consumption.

Chassis and cpu fans may use either 3 pin or 4 pin power connectors. A pwm capable fan is usually connected to a 4 pin connector pinout. The fourth wire connects to a circuit on the main board thats used to control the fan with precision.